std::numeric_limits<T>::is_exact
static const bool is_exact; |
(until C++11) | |
static constexpr bool is_exact; |
(since C++11) |
The value of std::numeric_limits<T>::is_exact
is true
for all arithmetic types T
that use exact representation.
Standard specializations
T |
value of std::numeric_limits<T>::is_exact |
---|---|
/* non-specialized */ | false |
bool |
true |
char |
true |
signed char |
true |
unsigned char |
true |
wchar_t |
true |
char8_t (C++20) |
true |
char16_t (C++11) |
true |
char32_t (C++11) |
true |
short |
true |
unsigned short |
true |
int |
true |
unsigned int |
true |
long |
true |
unsigned long |
true |
long long (C++11) |
true |
unsigned long long (C++11) |
true |
float |
false |
double |
false |
long double |
false |
Notes
While all fundamental types T
for which std::numeric_limits<T>::is_exact==true
are integer types, a library may define exact types that aren't integers, e.g. a rational arithmetics type representing fractions.
See also
[static]
|
identifies integer types (public static member constant) |
[static]
|
identifies signed types (public static member constant) |
[static]
|
identifies types that represent a finite set of values (public static member constant) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/types/numeric_limits/is_exact